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Appendices
Test Bed Receiver Subsystem Addendum – Rev 1 45
GEPB
Format:
Message ID = 77 Message byte count = 156
Field #
Data Bytes Format Units Offset
1
Sync 3 char
0
Checksum 1 char
3
Message Id 4 integer
4
Message byte count 4 integer bytes 8
2 GPS week of log output 4 integer weeks 12
3 GPS time of log output 8 double seconds 16
4 Reference week of ephemeris (in GPS time) 4 integer weeks 24
5 Reference time of ephemeris (in GPS time) 8 double seconds 28
6 GLONASS time - GPS time 4 integer seconds 36
7 Slot number 4 integer ordinal 40
8 Frequency 4 integer ordinal 44
9 Issue 15 min. reference 4 integer 900s 48
10 Health 4 integer - 52
11 X position (PZ90) 8 double meters 56
12 Y position (PZ90) 8 double meters 64
13 Z position (PZ90) 8 double meters 72
14 X velocity (PZ90) 8 double meters/s 80
15 Y velocity (PZ90) 8 double meters/s 88
16 Z velocity (PZ90) 8 double meters/s 96
17 X lunisolar acceleration (PZ90) 8 double meters/s/s 104
18 Y lunisolar acceleration (PZ90) 8 double meters/s/s 112
19 Z lunisolar acceleration (PZ90) 8 double meters/s/s 120
20 Tau 8 double seconds 128
21 Gamma 8 double seconds/second 136
22 Time of frame start 4 long seconds 144
23 Age of data 4 integer days 148
24 Flags (See Table 3 following) 4 integer - 152